Preheat your oven to 375°F (190°C). This ensures an even bake.

In a small bowl, mix together the topping ingredients: melted butter, Panko bread crumbs, chopped parsley, garlic powder, and Parmesan cheese. Set this mixture aside; it will add a delightful crunch!

Cook the pasta according to the package instructions until al dente. This is important, as the pasta will continue to cook in the oven.

In a large bowl, toss the cooked pasta with 2 cups of your favorite pasta sauce, Italian seasoning, shredded chicken, diced tomatoes, and parsley. This combination creates a flavorful base.

Transfer the pasta mixture into a 9x9-inch dish or a 2-quart casserole dish. Pour any remaining pasta sauce over the top, ensuring everything is well-coated.

Sprinkle mozzarella cheese generously over the dish, and then add the prepared topping mixture on top. This will give the bake a beautiful golden crust.

Bake in the oven for 23-25 minutes, or until the dish is golden and bubbly. Keep an eye on it to avoid over-baking!

For a crispy topping, consider broiling the dish for an additional 1-2 minutes after baking. Just watch it closely to prevent burning.